AUTHOR CORRECTION
Volume 81, no. 18, p. 6314–6323, 2015, https://doi.org/10.1128/AEM.01545-15. Page 6319, Fig. 4: The published figure contained duplicated panels (the photo labeled “Δpyr4Δasl1” displayed in second row, third column, and the photo labeled “Δasl1” displayed in third row, first column). As the original photos were no longer available, the entire image is resupplied here.

